How to fix A configuration issue prevents CDN from working
1. Login in to your WordPress admin
Assuming that you have already installed W3 cach and are using Cloudfare CDN, scroll down to performance and click CDN. You will see the error “How to fix A configuration issue prevents CDN from working”
2. Login to your cloudfare Account
After logging in to cloudfare, click on the SSL/TLS Icon
3. Click on Edge Certificates
4. Replace sites hostname in W3 Cach
Click save and purge, then you will see several Cnames automatically generated. Voila, you have now fully integrated Cloudfare with W3 Cach.